Rectobolivina sp. A

Hanagata, S & Nobuhara, T, 2015, Illustrated guide to Pliocene foraminifera from Miyakojima, Ryukyu Island Arc, with comments on biostratigraph, Palaeontologia Electronica (Cambridge, England) 33 (8), pp. 1-142 : 80

publication ID

https://doi.org/ 10.26879/444

persistent identifier

https://treatment.plazi.org/id/A029445F-E970-FFD5-4A53-BB767170A736

treatment provided by

Felipe

scientific name

Rectobolivina sp. A
status

 

Rectobolivina sp. A

Figures 25.13, 25.14 View FIGURE 25

1961? Siphogenerina aff. dimorpha (Parker and Jones) var. pacifica Cushman — LeRoy (Part 1), p. 37, pl. 3, figs. 97, 98.

Description. Test small and short for the genus, approximately 0.4 mm in length, 0.2 mm in breadth, 0.1 mm in thickness; triangular in front view, oval in transverse section; chambers not inflated, increasing slowly as added; surface wall coarsely pitted with pores; sutures slightly depressed, weakly limbate; aperture oval with marginal rim at the top of test.

Remarks. This species resembles Siphogenerina aff. dimorpha var. pacifica Cushman as illustrated by LeRoy (1961), in having a compressed test with coarsely pored wall. Siphogenerina dimorpha var. pacifica Cushman (1926) has a cylindrical test with a near-circular cross section.

Occurrence. Common in the lower part of the Yonahama Formation.

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